package thread;

public class SyncApiDemo {
    public static void main(String[] args) {
       // StringBuilder sb = new StringBuilder();
        StringBuffer sb = new StringBuffer();
        Thread t1 = new Thread(()->{
            for (int i=0;i<1000;i++){
                sb.append("abc");
            }
            System.out.println("t1拼接完毕");
        });
        Thread t2 = new Thread(()->{
            for (int i=0;i<1000;i++){
                sb.append("def");
            }
            System.out.println("t2拼接完毕");
        });
        t1.start();
        t2.start();
        try {
            Thread.sleep(40);
        } catch (InterruptedException e) {
        }
        System.out.println(sb.length());
    }
}
